[TenTec] Titan 425 & WARC bands

[k7gt at charter.net]

Rick, I have an even older Titan back at our home QTH. The fellow I bought it from
had a tuning chart for it that I am sure included 17m and may have included 12m.
If you would like, I will dig it out and forward the info to you when I am back there
over spring break (about two weeks away). My amp's S/N is 425-00273, I believe.
I have had it updated to include about all of the mods possible. The Hi/Lo voltage
switch has been removed and replaced with QSK/Relay, a change has been made in
the RF tank circuit (a new variable cap), there is now a grid current trip circuit, etc.
I also put mine in the light grey case to match the newer TT rigs: it looks great 
alongside the OmniVI!

Please let me know if you would like me to look up the tuning specs for the WARC
bands or if you obtain the info elsewhere. (If so, could you post it so we may
all have the info as a second source).

73  Allan K7GT

---- "Rick wrote: 
> OK, my second question after 10 years on the list.
> 
> I just picked up a Titan 425 (S/N 425-00727) which has been in storage 
> for about the same 10 years. It is in pristine condition. Had it on a 
> Variac for a few days and just tuned it up with full output on a few 
> bands. Reading the manual it says the following:
> 
> 
>                                              "Operation on the 10, 18 
> and 24 MHZ bands
> If and when the FCC permits linear amplifiers to be used on these bands, 
> your Titan will be capable of 10 and 18 Mhz operation only with slight 
> modification. in the unlikely event that high power operation is 
> permitted on 24 Mhz, TEN-TEC will make available information to permit 
> safe operation of your TITAN on that band. ANY ATTEMPT TO OPERATE YOUR 
> TITAN IN THE VICINITY OF 24 MHZ WITHOUT APPROPRIATE MODIFICATION MAY 
> CAUSE SERIOUS DAMAGE."
> 
> 
> So, I did a search of the archives to find these WARC band mods without 
> luck. Have not made the long distance call to Sevierville.
> 
> Who knows what the mods are? The collars are loose for 10 meter 
> operation and it loads here fine. Is there a 24 Mhz problem with the 
> plate choke like the Alpha 76A series?
> 
> I wanted this amp as a legal limit backup for the Alpha 99 and for the 
> second radio SO2R. If the mods are simple, I may keep this Titan. 
> Otherwise, I'll just keep going with the Centurion as backup and get rid 
> of the Titan. As they say, life is too short for QRP, especially on the 
> short side of life.
> 
> Oh, the tuning on 160 seems a bit odd. The first time I tuned it up, LV 
> position, the Ig was fine on the tuneup freq. QSY 10 khz low and the 
> overdrive LED lit up. QSY up in frequency, the drive was fine, ~ 35 ma. 
> Finally found a spot where the LOAD-TUNE combo worked ok, QSY up & down 
> 40 khz and Ig was ~35-50 ma. The LOAD control tuning seems very broad. 
> Is 160 tuning this flaky? Or, after 44 years playing radio, am I just 
> doing it wrong?
> 
> Thanks for any help you folks may have. It is always interesting reading 
> the list.
> 
> 73,
> 
> Rick, W6RKC
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